4. Drive shaft and axle

There are front axle and rear axle. The difference between front/rear axles is only the spiral direction of the spiral pinion in final drives. The spiral pinion of final drive for front axle is LH spiral, while that for rear axle is RH spiral. Their configuration is the same.

Drive shaft & axle consist of front & rear drive shafts, final drive, axle housing and wheel speed reducer. Front/rear drive shaft is between transmission and front/rear axle. Final drive is one-stage spiral bevel gear deceleration. Differential consists of two axle shaft gears and four bevel gears. Differential spider is an integral part. The left & right axle shafts are fully floating. Wheel reduction gear is planetary. Ring gear and wheel spindle are not rotated. Planet carrier and rim are fixed as a unit, so sun gear which receives axle shaft torque drives planet carrier and wheel.

4.1 Adjustment of final drive (Figure 3-5) and wheel reduction gear:

4.1.1 The following requirements should be satisfied when installing and adjusting bearings 27310 and 27311:

When the spiral pinion is not meshed, and oil seal (2) and cover (3) are not mounted, gradually decrease the number of shims (4) so that the force for pulling the input flange in tangent direction is measured at 4-5kg when the castle nut is tightened with 35-40kg.m. At final assembly, the castle nut should also be tightened with 35-40kg.m.

4.1.2 Installation distance of spiral bevel gear must be correctly adjusted to ensure correct mesh of gears. You can adjust nut (12) and shims (4) to achieve correct contact pattern. You can use renderer to check the contact pattern between spiral pinion and bevel gear (see Figure 3-4). The contact area should be 30-50% along the length of tooth and 50% along the height of tooth. And keep 0.2-0.35mm backlash.

4.1.3 Backlash between the axle shaft gear of differential and bevel gear is 0.1mm and ensure that you can use hand to rotate without clogging after installation.

4.1.4 Use adjusting nut to adjust bearing 7515 (13), to keep its end play within range of 0.03-0.05 mm.

4.1.5 When servicing and replacing the wheel deceleration gear, check contact pattern with rendering. The contact area should not be less than 40% along tooth height, and not less than 50% along tooth length. When replacing planet gear roller pin, you must make grouping selection for all roller pins and the allowable difference among diameters in the same group should not exceed 0.005mm. The roundness and cylindricity should be kept under 0.03mm. The radial clearance between roller pin, gear inner hole and shaft is 0.015-0.03mm.

4.2 Maintenance of axle:

Change the lubricant in the final drive and wheel speed reducer every 1200 working hours. Choose appropriate lubricant according to different climate and seasons.

When replacing lubricant, discharge the waste oil when machine is still warm, pay attention to check metal debris in waste oil.

It should be disassembled for inspection every 2400 operation hours.

If a tire is damaged, normally you need to replace four tires; at least you need to replace two tires on the same axle to ensure proper work of differential.

Forward contact surface Big end Reverse contact surface

Contact patch is closer to small end, the center of the patch is at 1/3 of the tooth length, do not extend to tooth edge.

Opposite to the forward contact surface